<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 添加商品提示信息 -->
      <el-alert title="添加商品信息" type="info" :closable="false" center show-icon></el-alert>
      <!-- 步骤条 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab标签 -->
      <!-- 实现和步骤条联动的核心思想是绑定同一个数据项，因为标签绑定的是字符串，步骤条是数字，所以需要转换 -->
      <!-- 注意，因为需要把五条信息绑定在一起，所以需要在他们外面绑定表单，但因为el-tabs的默认子节点就是el-tab-pane,所以需要绑定到外面 -->
      <el-form
        :model="addForm"
        label-position="top"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number" type="number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop>
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                expandTrigger="hover"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="v" v-for="(v,i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action上传文件的路径，是绝对路径 -->
            <!-- 虽然看着像上传上了，但其实没上传上，看msg: "无效token", status: 400，
            原因，除了登录，每次发送请求，都会带一个token,而el-load自己内部封装了一个token,看element文档，设置header请求头-->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <!-- 上传文件提示 -->
              <!-- <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div> -->
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    return {
      activeIndex: '0',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_number: 0,
        goods_weight: 0,
        //所选中商品分类的数组
        goods_cat: [],
        //图片的数组
        pics: [],
        //商品的详情参数
        goods_introduce: '',
        //商品的参数
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请输入商品分类', trigger: 'blur' }
        ]
      },
      //商品分类数据列表
      cateList: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //动态参数列表数据
      manyTableData: [],
      //静态参数数据列表
      onlyTableData: [],
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      //图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      //图片路径
      previewPath: '',
      //预览对话框的显示与隐藏
      previewVisible: false
    }
  },
  created: function() {
    this.getCateList()
  },
  methods: {
    //获取商品分类数据列表
    getCateList: async function() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据列表失败')
      }
      this.cateList = res.data
      // console.log(this.cateList)
    },
    //选中商品时触发
    handleChange: function() {
      //如果选择的商品分类不是3级分类时，则清空数组
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave: function(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    tabClicked: async function() {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: {
              sel: 'many'
            }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败')
        }
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
        // console.log(this.manyTableData)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: {
              sel: 'only'
            }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败')
        }
        this.onlyTableData = res.data
        console.log(this.onlyTableData)
      }
    },
    //点击文件时触发,处理图片预览效果
    handlePreview: function(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      //显示图片预览
      this.previewVisible = true
    },
    //文件清除的时候触发
    handleRemove: function(file) {
      //获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      //从pics中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      //调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1)
      // console.log(this.addForm)
    },
    //上传成功时调用
    handleSuccess: function(response) {
      //拼接得到一个图片对象
      const picInfo = {
        pic: response.data.tmp_path
      }
      //将图片对象push到pics中
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm)
    },
    //添加商品的按钮
    add: async function() {
      this.$refs.addFormRef.validate(valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
      })
      //处理添加
      //因为goods_cat要求字符串上传，所以需要把数组转变为字符串，但是又因为goods_cat绑定的级联选择器必须是数组，所以会造成冲突
      //解决方案，深拷贝一个addForm提交表单，然后把goods_cat的数组格式转变为字符串

      const form = _.cloneDeep(this.addForm)
      form.goods_cat = form.goods_cat.join(',')
      // console.log(form)
      //处理动态参数
      this.manyTableData.forEach(item => {
        const newInfo = {
          attr_id: item.attr_id,
          attr_value: item.attr_vals.join(' ')
        }
        this.addForm.attrs.push(newInfo)
      })
      //处理静态参数
      this.onlyTableData.forEach(item => {
        const newInfo = {
          attr_id: item.attr_id,
          attr_value: item.attr_vals
        }
        this.addForm.attrs.push(newInfo)
      })
      form.attrs = this.addForm.attrs
      //添加商品到数据库
      const { data: res } = await this.$http.post('goods', form)
      console.log(res)

      if (res.meta.status !== 201) {
        return this.$message.error('添加商品失败')
      }
      this.$message.success('添加商品成功')
      this.$router.push('/goods')
    }
  },
  computed: {
    cateId: function() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      } else {
        return null
      }
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>